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Noun
A
large
triangular
bone
at
the
base
of
the
spine
,
located
between
the
two
ilia
(
wings
of
the
pelvis
)
and
formed
from
vertebrae
that
fuse
in
adulthood
.
Made with ♥ by Homo Sapiens on Planet Earth

Rejected by Y-Combinator. Definitions by Wiktionary.

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